Holly Dam
Holly Dam is an earth dam located in Oakland County, Michigan, built in 1840. It carries a Significant hazard potential classification and has a poor condition assessment.
About Holly Dam
The primary purpose of Holly Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Village Of Holly (local government). It impounds the Shiawassee River near Fenton.
The dam stands 12 feet tall and stretches 400 feet across, creates a reservoir covering 90 acres, has a maximum storage capacity of 555 acre-feet, and collects water from a drainage area of 40 square miles. Completed in 1840, the structure is one of the older dams in the region, with over a century and a half of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 07/31/2017.
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Location
| State | Michigan |
| County | Oakland |
| Nearest City | Fenton |
| River/Stream | Shiawassee River |
| Coordinates | 42.78514, -83.62426 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 400 ft |
| Year Completed | 1840 (186 years old) |
Storage & Hydraulics
| NID Storage | 555 acre-ft |
| Max Storage | 555 acre-ft |
| Normal Storage | 430 acre-ft |
| Surface Area | 90 acres |
| Drainage Area | 40 sq mi |
| Max Discharge | 600 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Village of Holly |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 07/31/2017 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MI00253 |
| Federal ID | MI00253 |
| More Info | State Dam Safety Program |